The Clockwork Fairy Kingdom — Leah Cutter

Adele -- a beautiful fairy queen with wings of clockwork -- despairs when her husband, the Master Tinker, dies before he finishes the machinery that will drive the humans away and restart the human-fairy war. Then she meets Dale, a human boy with natural talent who can finish the machine. She enslaves Dale and binds his will with fairy magic. However, Adele fails to capture Dale's twin sister Nora, who has only recently discovered that she is a Maker and has power of her own. Can Nora accept the magic that makes her different and save both her brother and herself before the fairy kingdom clockwork can be turned on, killing millions of innocent people?